鐵鈀銦及鐵鈀金鐵磁性形狀記憶合金均質化處理之研究

本論文中探討冷滾壓以及均質化處理對於快速凝固旋淬法製備的 FePd29.5In0.5 and FePd30-xAux (x = 1, 5 and 7) 鐵磁性形狀記憶合金薄帶在相變化溫度、磁性質、磁致伸縮與形狀記憶效應的影響。初製成的FePd29.5In0.5試片中含有少量bct相，相同試片經過均質化處理之後則完全為bct相，而初製成以及均質化後的FePd30-xAux (x = 1, 5 and 7)試片則沒有觀察到bct相。初製成的FePd30-xAux (x = 1, 5 and 7)薄帶Af溫度隨著Au的含量上升，而均質化後的薄帶Ms溫度隨著Au的含量下降。在室溫下FePd23Au7為母相。初製成FePd29.5In0.5試片比均質化處理的試片有較高的室溫飽和磁化量，但是矯頑磁場較小。而FePd30-xAux (x = 1, 5 and 7)試片不論是初製成或者是均質化後的室溫飽和磁化量都隨著Au的比例而下降。磁致伸縮值方面，初製成FePd29.5In0.5薄帶在與9 kOe的磁場方向呈80度夾角時有375ppm，稍小於均質化薄帶在與9 kOe的磁場方向呈70度夾角時的415ppm。均質化的FePd30-xAux在9 kOe的場下對於X = 1, 5 和 7 時則表現出1240 ppm @ 90°, 1330 ppm @ 80° and 760 ppm @ 90°的值，其中FePd23Au7在測量時為母相。由於均質化處理後的FePd29.5In0.5試片呈現完全bct相，因此並不具有任何形狀記憶的效果，而初製成的薄帶則在經過五十次熱循環後還保有35%的雙向形狀回復率。。添加金的試片中，無論是初製成或者是均質化後的試片都表現出雙向形狀記憶效應，在經過五十次熱循環後前者最高有58% (FePd23Au7)的雙向形狀回復率而後者最高只達到10%。

關鍵字

鐵磁性；形狀記憶；薄帶；均質化

並列摘要

In this study the effect of cold rolling and homogenization on the transformation temperature, magnetization, magnetostriction and shape memory effect for melt-spun FePd29.5In0.5 and FePd30-xAux (x = 1, 5 and 7) alloys were investigated. The homogenized FePd29.5In0.5 ribbon exhibited complete bct phase while only little bct was observed in the as-spin ribbon, on the other hand, no bct phase was observed in both as-spun and homogenized FePd30-xAux ribbons (x = 1, 5 and 7). The Ms of homogenized FePd30-xAux was found to decrease with Au content, while the Af of as-spun FePd30-xAux increased with Au content. At room temperature FePd23Au7 exhibited complete parent phase. As-spun FePd29.5In0.5 ribbon exhibited higher room temperature saturated magnetization than that of homogenized sample, while the coercive field of the latter is lower. For as-spun and homogenized FePd30-xAux ribbon the room temperature saturated magnetization decreased with increased Au content. The magnetostriction of as-spun FePd29.5In0.5 reached maximum at 375 ppm under 9 kOe at 80° with respect to the field, and that of homogenized sample reached maximum at 415 ppm at 70° under 9 kOe. Homogenized FePd30-xAux exhibited higher magnetostriction under 9 KOe field, and the values are 1240 ppm at 90°, 1330 ppm at 80° and 760 ppm at 90° for X = 1, 5 and 7 respectively. As-spun FePd29.5In0.5 exhibited Two-way shape memory effect with recovery ratio up to 35% after 50 thermal cycles, while the homogenized ribbon showed no shape memory effect due to the BCT phase. For homogenized FePd30-xAux the recovery ratio was only up to 10% after 50 thermal cycles while that of as-spun ribbon exhibited much higher recovery ratio up to 58% for X=7.

並列關鍵字

Ferromagnetic ； Shape Memory ； Ribbon ； Homogenization

參考文獻

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鐵鈀銦及鐵鈀金鐵磁性形狀記憶合金均質化處理之研究

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